EP2342065B1 - Verbesserter ofen für die thermische konditionierung von aus einem thermoplastischen material hergestellten vorformlingen - Google Patents

Verbesserter ofen für die thermische konditionierung von aus einem thermoplastischen material hergestellten vorformlingen Download PDF

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Publication number
EP2342065B1
EP2342065B1 EP09783964A EP09783964A EP2342065B1 EP 2342065 B1 EP2342065 B1 EP 2342065B1 EP 09783964 A EP09783964 A EP 09783964A EP 09783964 A EP09783964 A EP 09783964A EP 2342065 B1 EP2342065 B1 EP 2342065B1
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EP
European Patent Office
Prior art keywords
air
oven
preforms
extraction
heating
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EP09783964A
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English (en)
French (fr)
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EP2342065A1 (de
Inventor
François QUETEL
Jérôme Demare
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Sidel Participations SAS
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Sidel Participations SAS
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
    • B29B13/023—Half-products, e.g. films, plates
    • B29B13/024—Hollow bodies, e.g. tubes or profiles
    • B29B13/025—Tube ends
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/46—Component parts, details or accessories; Auxiliary operations characterised by using particular environment or blow fluids other than air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/68—Ovens specially adapted for heating preforms or parisons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0822—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using IR radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/16—Cooling
    • B29C2035/1658—Cooling using gas
    • B29C2035/1666—Cooling using gas dried air

Definitions

  • the invention relates to an oven for the thermal conditioning of thermoplastic preforms.
  • thermoplastic material for example PET (polyethylene terephthalate)
  • PET polyethylene terephthalate
  • Such preforms are preconditioned thermally in an oven in order to allow their transformation, in particular by a blowing operation, or stretch-blow molding, into a hollow body container.
  • the preforms generally have a specimen shape mainly comprising a body, more or less long, and a neck that already has its final shape.
  • the neck of the preform forms the neck of the container and comprises for example a thread for receiving a screw cap.
  • one type of heating furnace for the thermal conditioning of preforms, such as that described in the document EP-A1-1.699.613 which comprises a cooling circuit provided with ventilation means adapted to obtain cooling by circulation of an air flow.
  • the cooling circuit of such an oven mainly comprises a first zone, for the cooling air intake, a second intermediate zone, for heating equipped with preform heating means, for example infrared radiation lamps (IR ), and a third zone, for the extraction of air after reheating during the passage in the second zone.
  • preform heating means for example infrared radiation lamps (IR )
  • IR infrared radiation lamps
  • the zones are for example integrated inside the furnace and are arranged so that the extraction in the third zone is generally carried out in the upper or upper part of the furnace, the heating zone being interposed between said first and third zone.
  • the air intake is carried laterally.
  • Other arrangements are however possible, for example such that the admission is done in the lower part.
  • the cooling circuit, by air circulation, of such an oven has the function of moderating the effects of thermal conduction through the air mass contained in the oven and to use the maximum infrared radiation means of heating, in order to heat up the thickness of the body of the preforms without burning the outer surface, called "skin". This makes it possible to avoid any degradation of said skin of the preforms but also to maintain the environment of the heating zone below temperatures likely to to affect the mechanical parts therein, such as for example the caps of the infrared lamps.
  • the ventilation means comprise for example at least one centrifugal fan which draws air from the outside of the oven, through the intake zone, and blows the air sucked towards the preforms to stir the hot air at within the furnace heating zone, especially in the vicinity of the preforms.
  • the infrared radiation is best exploited, which makes it possible to bring the body of the preform to the desired temperature, homogeneously over the thickness of the wall of the body, without deteriorating the outer surface of the body of the preforms or soften the neck of the preforms.
  • the oven also comprises means of protection able to protect the necks of the preforms from infrared radiation as well as means dedicated to the cooling of the necks, which consist, for example, of a part of said flow of cooling air and / or means additional cooling, especially by circulating water.
  • the extraction zone of the furnace comprises extraction means, associated with the extraction duct, such as an extractor hood which overhangs the heating zone, and which is intended to extract towards outside, through the exhaust duct, the air from the heating zone of the oven, in particular to remove calories from the oven.
  • extraction means associated with the extraction duct, such as an extractor hood which overhangs the heating zone, and which is intended to extract towards outside, through the exhaust duct, the air from the heating zone of the oven, in particular to remove calories from the oven.
  • Such extraction means also make it possible to recover and evacuate toxic residual vapors of sterilizing agent when a decontamination operation of the interior of the preform is carried out simultaneously with the thermal conditioning.
  • Such a decontamination operation is advantageously obtained by the deposition by condensation of a sterilizing agent - such as hydrogen peroxide (H2O2) - intended to be activated thermally in the oven by the heating means and then discharged in the vapor state. by the air extraction means.
  • a sterilizing agent - such as hydrogen peroxide (H2O2) - intended to be activated thermally in the oven by the heating means and then discharged in the vapor state. by the air extraction means.
  • the extraction zone and the heating zone are arranged vertically one above the other and they are separated from each other by a void space which is completely open and through which flows the air coming from the zone heating up to be captured and evacuated through the exhaust duct.
  • a preform heat-conditioning furnace necessarily comprises, whatever its design, such an opening in its upper part to allow the cooling air, heated to the result of its crossing of the heating zone, to be evacuated by the overhanging extraction means, see naturally by convection outside the oven in the absence of such means.
  • Another of its concerns relates generally to the hygiene and cleanliness of the containers, so preforms intended to be transformed into containers after blow-molding (or stretch-blow molding) containers which are then preferably filled directly in medium aseptic after their manufacture.
  • the filtration control of the quality of the ventilated air is limited by the efficiency of the filters, in particular for the removal of particles, such as microorganisms, whose size is of the order of 1 .mu.m.
  • the document US Patent 5,714,109 proposes an oven which aims to isolate the oven drafts and surrounding dust according to the preamble of claim 1.
  • the oven comprises a conduit in which the preforms are arranged to be heated and subject to a cooling flow.
  • the conduit comprises in particular an end that allows the cooling air to be discharged downstream of the preforms.
  • This duct comprises a fan which is arranged upstream of the preforms for the circulation of air in the duct.
  • the invention aims in particular to further improve the cleanliness of the preforms, and therefore the containers, without however altering the thermal conditioning of the preforms operated in the oven.
  • the invention proposes closing the air extraction zone to isolate the interior of the furnace, particularly at least the heating zone in which the preforms circulate, with respect to the external environment of the furnace.
  • Such problems include the presumed impossibility of satisfactorily controlling the thermal conditioning by the combined application of heating and cooling, in particular such a closure would cause a rise in temperature prejudicial to the proper thermal conditioning of the preforms. and also likely to damage the mechanical parts, such as the caps of the lamps.
  • the furnace comprises a duct in which the preforms are arranged to be heated and subjected to a flow of cooling air.
  • the duct has a first end which is connected to an air conditioning unit and a second end which allows to evacuate the cooling air downstream of the preforms.
  • the duct comprises a fan which is arranged upstream of the preforms for the circulation of air in the duct.
  • the invention more particularly proposes an oven of the type described above, characterized in that the oven comprises a containment chamber which, extending from the air extraction duct to at least the heating zone, is able to isolate at least said heating zone relative to the outside of the oven to avoid pollution of inside the oven with airborne pollutant particles.
  • the confinement chamber according to the invention, it prevents the entry of polluting particles inside the oven, in particular in the heating zone through which the preforms pass, when the oven is in operation.
  • the opening or empty space which separated in the former furnaces the air extraction zone and the heating zone was a potential pollution zone of the inside of the furnace since certain polluting particles were likely, through this opening, to penetrate to the heating zone and this despite the rising air flow which, in operation, is sucked by the hood.
  • polluting particles may be deposited on the preforms, or mechanical members, and thus pollute directly or later preforms.
  • upstream and downstream will also be used with reference to the flow direction of the cooling air flow inside the oven, that is to say from the so-called upstream admission zone the extraction zone, called downstream, of the furnace.
  • thermoplastic material for example PET (polyethylene terephthalate).
  • the furnace 10 comprises for example here a heating path of the "U" preforms comprising two parallel longitudinal heating sections, one go, the other return, connected together a transverse curvilinear section, said stabilization.
  • the furnace 10 is generally in the form of a tunnel extending longitudinally, from back to front, from a first rear side 12, to a closed second front side 14.
  • the rear side 12 is open to allow the passage of the preforms. However, it is open in a pressurized zone, as will be described later, so that polluting particles can not enter the furnace through this rear side 12.
  • the furnace 10 has a general design symmetry with respect to a median vertical plane (not shown) extending longitudinally through the middle of the furnace 10, and identical elements are designated by the same references indexed "a" or " b ".
  • the oven 10 is only one of the stations of a container manufacturing facility, for example bottles, from preforms.
  • Such a manufacturing facility comprises for example a feeding device (not shown) in preforms, which feeds the furnace 10 in preforms by the rear side 12 of the furnace 10.
  • the preforms are introduced inside the furnace 10 by transfer means at the rear side 12 where the preforms are supported by conveying means of the furnace 10, an operation also called "cladding".
  • the preforms are then entrained in the furnace 10 by the conveying means (not shown), for example here following a U-shaped heating path.
  • the preforms emerge from the furnace 10 through the rear side 12 and are, after having been thermally conditioned by the furnace 10, taken over by other transfer means (not shown) to direct them directly to a molding device. (not shown) for blow-molding or stretch-blow molding into a hollow container.
  • the conveying means of the preforms are capable of transporting the preforms along the heating path and comprise support elements (not shown), also sometimes called “spinners", each of which cooperates with the inner wall of the neck of each preform.
  • the support elements of the conveying means are able to rotate each of the preforms in rotation in order to promote a homogeneous and uniform distribution of the heat in the body of each preform.
  • the furnace 10 is traversed by a preform cooling air flow A, which flows from upstream to downstream, through the furnace 10, more precisely here vertically from bottom to top.
  • the furnace 10 essentially comprises a cooling circuit 16, comprising successively in the direction of flow of the main air flow A, an air intake zone 16a, also called upstream zone, a heating zone 16b of the preforms and an extraction zone 16c of air, still called downstream zone.
  • the three zones 16a, 16b, 16c are superimposed here vertically and the flow of the main air flow A is carried out successively through each zone, from the bottom to the high, that is to say also along a thermal gradient from the coldest zone to the hottest zone.
  • the air intake zone 16a comprises connecting means such as at least one air inlet duct 18 through which the main air flow A flows from outside the furnace 10, to inside the oven 10.
  • the air intake duct 18 is equipped with an air inlet 20 which opens out vertically towards the bottom of the oven 10.
  • the air inlet 20 is equipped by means of filtration 21, 23 of the sucked air, so that only filtered air, with a certain degree of cleanliness, is sucked in and introduced into the admission zone. 16a of the oven 10.
  • the filtration means comprise at least a first upstream filter 21 and a second downstream filter 23 respectively.
  • the upstream filter 21 has a passage section greater than that of the downstream filter 23.
  • the heating zone 16b is delimited transversely by a peripheral enclosure 32.
  • the peripheral enclosure 32 comprises at least one so-called lower part, comprising a first vertical vertical wall 32a and a second vertical lateral wall 32b which are arranged transversely opposite one another and each of which extends longitudinally, to delimit transversely between them, inside the furnace 10, the heating zone 16b.
  • heating zone 16b is delimited longitudinally forwards by the front side 14 closed, and backwards by the rear side 12 open.
  • Each side wall 32a, 32b of the peripheral enclosure 32 preferably comprises a plurality of doors 34, here five in number, which allow access to the interior of the furnace 10, for example to carry out control or control operations. maintenance inside the oven 10.
  • Each door 34 has a ventilation grid 36 to allow the flow of the main air stream A from the outside of the oven 10 to the intake duct 18.
  • Each wall 32a, 32b of the peripheral enclosure 32 comprises a lower plate 38a, 38b respectively covering the furnace 10, which extends vertically substantially from the bottom of the doors 34 to the ground.
  • the heating zone 16b is delimited vertically downwards by a floor 40 through which the vertical intake duct 18 extends.
  • peripheral enclosure 32 defines, downstream, an upper opening 50, which opens vertically upwards, to allow the main air flow A to flow upwards.
  • the upper opening 50 extends over the entire perimeter of the furnace 10, longitudinally from the rear side 12 to the front side 14 and transversely between the walls of the enclosure 32.
  • the heating zone 16b includes lateral heating means 22 for the preforms, for example infrared radiation (IR) lamps which, when they are activated, irradiate the bodies of the preforms in order to heat them and bring them to a temperature suitable for allowing their subsequent transformation into a container.
  • IR infrared radiation
  • the infrared radiation lamps are for example superimposed in a rack forming a heating module, heating modules being arranged, side by side, one after the other in the direction of travel of the preforms in the oven 10, here longitudinally along the outward and return sections of the heating course, with the exception of the stabilization adjacent the front side 14 closed and the rear side 12 open for the entry and exit of the preforms.
  • the heating zone 16b comprises a series of ventilation means, such as centrifugal fans, 24 (only one of which is shown in FIG. figure 2 ) which are arranged in the center of the oven 10, opposite the infrared radiation lamps, so that the preforms pass between the lamps and the centrifugal fans 24.
  • ventilation means such as centrifugal fans, 24 (only one of which is shown in FIG. figure 2 ) which are arranged in the center of the oven 10, opposite the infrared radiation lamps, so that the preforms pass between the lamps and the centrifugal fans 24.
  • Each centrifugal fan 24 is associated with a distributor 26 of the main air flow A, the distributor 26 being interposed transversely between the heating means 22.
  • centrifugal fans 24 are rotated by a drive means, here a first motor 27, whereby each centrifugal fan 24 draws air through an upstream air inlet 28 of the distributor 26 and blows, or projects, the air thus sucked globally in a transverse direction on the preforms and the heating means 22, through two opposite lateral outlets 30a, 30b which are each arranged facing the heating means 22.
  • a drive means here a first motor 27, whereby each centrifugal fan 24 draws air through an upstream air inlet 28 of the distributor 26 and blows, or projects, the air thus sucked globally in a transverse direction on the preforms and the heating means 22, through two opposite lateral outlets 30a, 30b which are each arranged facing the heating means 22.
  • the filtered air sucked is preferably blown by the centrifugal fans 24 through perforated reflectors which comprise for example vertically oriented slots forming said lateral outlets 30a, 30b.
  • the reflectors are arranged transversely vis-à-vis the heating means 22 and are intended to reflect the infrared radiation to increase the efficiency of heating, while allowing the passage of cooling air.
  • centrifugal fans 24 stir the air which is located in the vicinity of the heating means 22 and preforms, in particular to avoid burning the outer surface of the body of the preforms and to homogenize the heating of the body of the preforms.
  • centrifugal fans 24 create an overpressure in the heating zone 16b, in the vicinity of the preforms.
  • the first motor 27 cooperates with a first control means 29, to vary the rotational speed of the centrifugal fans 24 and therefore vary the flow of air blown on the preforms.
  • the heating zone 16b includes thermal protection means (not shown) of the neck of the preforms to prevent their deformation by heating.
  • the air extraction zone 16c comprises at least one air extraction duct 42 through which the main air flow A flows from the inside of the furnace 10, towards the outside of the furnace. oven 10.
  • the downstream end of the extraction duct 42 is for example connected to an evacuation circuit which guides the air extracted from the furnace 10 into a space heating circuit, or outside the room in which the furnace is located. 10.
  • the extraction duct 42 of the air comprises associated extraction means 44, for example a fan 44, able to create a vacuum upstream of the fan 44, in the extraction duct 42, in order to extract the air towards the outside of the furnace 10, according to the direction of the arrows represented on the figure 2 .
  • associated extraction means 44 for example a fan 44, able to create a vacuum upstream of the fan 44, in the extraction duct 42, in order to extract the air towards the outside of the furnace 10, according to the direction of the arrows represented on the figure 2 .
  • vacuum here means a pressure lower than the atmospheric pressure prevailing outside the furnace 10.
  • the extraction zone 16c of air is isolated from the outside of the furnace 10, by means of a confinement chamber 46.
  • the confinement chamber 46 advantageously constitutes a first, so-called upper part, of the enclosure 32.
  • the confinement chamber 46 extends from the downstream opening 50 of the heating zone 16b to the extraction duct 42, so as to isolate at least the heating zone 16b with respect to the outside of the oven 10, to prevent pollution of the inside of the furnace 10 by airborne polluting particles.
  • the confinement chamber 46 completely closes the upper opening 50 that previously existed between the heating zone 16b and the extraction duct 42, if the empty space above the heating zone 16b remains, it is now closed by the confinement chamber 46 which, in the manner of a lid, insulates it from the outside of the oven 10.
  • the containment chamber 46 comprises at least one extractor hood 52 which has a flared shape towards the heating zone 16b and therefore a decreasing section upwards.
  • the confinement chamber 46 extends vertically upwards from a base 53 of rectangular shape.
  • the lower base 53 of the hood 52 of the containment enclosure 46 has two opposite longitudinal edges, generally rectilinear, which are connected on an upper edge of the walls 32a, 32b respectively of the oven side 10.
  • the containment chamber 46 also comprises a first plate 48a and a second upper horizontal plate 48b which are respectively contiguous to a first edge and to a second transverse edge of the base 53 of the hood 52, in order to delimit the zone vertically. heating 16b of the oven 10.
  • the first plate 48a and the second plate 48b are here each equipped with a inspection hatch (not shown) to access the inside of the oven 10 from the top of the oven 10, for example to perform maintenance tasks.
  • the hood 52 of the containment enclosure 46 extends longitudinally over the forward and return sections of the heating path along which the heating means 22 are arranged, while the first plate 48a and the second plate 48b are respectively arranged above the first rear side 12 and the second front side 14.
  • the first plate 48a and the second plate 48b form a ceiling, which, in addition to the hood 52, completely closes the inside of the oven 10, each of the plates 48a, 48b cooperating with the lower part of the enclosure 32 formed by the vertical walls 32a, 32b.
  • the containment chamber 46 is able to collect the main air flow A flowing from the heating zone 16b, to extract the main air flow A to the outside through the air duct. extraction 42.
  • the containment chamber 46 defines secondary or auxiliary air intake ports 54, which are arranged downstream of the heating zone 16b, so that a secondary air flow B, said leakage, flows through the air intake vents 54 under the effect of the depression generated by the fan 44 of extraction.
  • the air of the secondary air stream B flows from the outside of the furnace 10, directly to the air extraction duct 42, without passing through the sensitive heating zone 16b.
  • each secondary air intake port 54 has a plurality of orifices 56 which are aligned longitudinally on either side of the hood 52, in the vicinity the junction of the base 53 of the hood 52 on the side walls 32a, 32b.
  • Such a design promotes the entry of air through the air intake port 54, rather than through a parasitic air inlet, uncontrolled, without the risk of polluting the preforms or internal organs of the oven 10 .
  • the air extraction rate through the extraction duct 42 is greater than the filtered air flow sucked and ventilated by the centrifugal fans 24 so as to evacuate all the ventilated cooling air and to ensure that the parasitically penetrating air inside the furnace 10 due to the depression existing downstream of the extraction duct 42 penetrates exclusively through said secondary air inlet vents 54.
  • the air extraction fan 44 is rotated by means of a second motor 58 which, depending on its operating speed, varies the rotational speed of the fan 44 and therefore makes vary the depression downstream of the fan 44 and the flow of air extracted by the fan 44 through the extraction duct 42.
  • the oven 10 comprises a second control means 60 of the fan 44 for extracting air, which cooperates with the second motor 58 in order to vary the operating speed.
  • the furnace 10 comprises a first measurement means 62 of the depression within the extraction zone 16c of air, upstream of the exhaust fan 44.
  • the measuring means 62 of the depression is here a pressure measuring means differential, or differential pressure transmitter, for example a piezoresistive pressure sensor.
  • the measuring means 62 of the depression measures the pressure difference between the outside of the furnace 10 and a point located inside the containment enclosure 46, upstream of the exhaust fan 44 and downstream of the mouth associated secondary air inlet 54.
  • the second control means 60 controls the fan 44 for extracting air as a function of the value of the differential pressure measured by the measuring means 62 and a setpoint depression value, in order to regulate the flow rate of the extracted air by the exhaust fan 44 according to the associated setpoint value.
  • control means 60 makes it possible to obtain a constant flow rate of air, as a function of the depression set point value, independently of the state of the air inlet 20 of the intake duct 18, in particular the state of fouling of the filtering means 21, 23.
  • the depression setpoint value is predetermined so as to create a vacuum within the confinement enclosure 46, whereby the flow rate of air extracted through the extraction duct 42 is greater than the flow rate of air blown on the preforms by the centrifugal fans 24, independently of the flow of air blown onto the preforms by the centrifugal fans 24.
  • control means 60 constitutes a servocontrol means for the centrifugal fans 24 and the exhaust fan 44.
  • the depression reference value is for example between 0 and 100 Pascals.
  • the oven 10 operates in a so-called production mode, in which the heating means 22 are activated, or in a so-called non-production mode, in which the heating means 22 are deactivated.
  • the production mode corresponds to a normal heating operation of the preforms, and the non-production mode corresponds to any other operating state of the oven 10, for example a standby mode of the oven 10, or a maintenance mode.
  • the centrifugal fans 24 and the exhaust fan 44 are rotated continuously, regardless of the mode in which the oven 10 operates, whereby the furnace 10 is permanently traversed by the main airflow A.
  • centrifugal fans 24 are controlled by the associated control means 29, so that the air flow rate that is blown by the centrifugal fans 24 is lower in the non-production mode than in the production mode of the oven 10.
  • the depression setpoint value varies depending on the mode in which the oven operates, the depression setpoint value is lower when the oven 10 is operating in non-production mode.
  • the vacuum set point is determined so that the flow rate of the air flow extracted by the exhaust fan 44 is sufficient to extract the surplus heat in the oven 10.
  • the first depression setpoint value is determined so that the flow rate of the air flow extracted by the exhaust fan 44 is sufficient to prevent any pollutant particles deposit on the preforms or on an internal member of the furnace 10, in particular the polluting particles which are sucked through the secondary air inlet mouth 54.
  • the air intake zone 16a comprises means 70, 72 for detecting the fouling of the filtration means 21, 23.
  • the fouling detection means comprise a second means 70 for measuring the depression, similar to the first detection means 62 described above.
  • the second measuring means 70 measures the pressure difference between the outside of the furnace 10 and a space which is situated between the first upstream filter 21 and the second downstream filter 23 of the air inlet 20.
  • the second measuring means 70 is able to measure the state of fouling, or clogging, of the upstream filter 21 by comparison of the measured depression and a predetermined reference value.
  • the fouling detection means comprise a third measuring means 72 which measures the pressure difference between a space which is located between the first upstream filter 21 and the second downstream filter 23, and a space which is located directly downstream of the second filter 23 downstream of the air inlet 20.
  • the third measurement means 72 is able to measure the state of fouling, or clogging, of the second downstream filter 23 by comparison of the measured depression and a predetermined reference value.
  • the furnace 10 comprises a first air flow measurement means which is arranged in the extraction duct 42, and a second air flow measurement means which is arranged in the duct. admission 18.
  • the first and the second means for measuring the air flow each cooperate with the second control means 60 of the exhaust fan 44, so that the air flow that is extracted through the duct extraction 42 is higher than the intake air flow blown by the centrifugal fans 24.
  • the furnace 10 comprises sterilization or sanitization means (not shown) which are capable of emitting ultraviolet rays in order to irradiating internal furnace members that are likely to be in contact with the preform, for example the spinners that cooperate with the inner wall of the neck of the preforms.
  • the preforms are sterilized by means of a sterilizing agent such as hydrogen peroxide deposited by condensation inside the preform, which agent evaporates when it is subjected to the heating means of the oven 10, then is sucked by the hood 52.
  • a sterilizing agent such as hydrogen peroxide deposited by condensation inside the preform, which agent evaporates when it is subjected to the heating means of the oven 10, then is sucked by the hood 52.
  • the invention also relates to an oven 10 which does not include a fan 44 extraction, and / or no centrifugal fan 24 for blowing air on the preforms, the furnace 10 then being crossed upstream downstream by a main air flow flowing vertically to the extraction duct 42 by convection.
  • the invention is not limited to an oven of generally parallelepiped shape, such as that described above.
  • the invention is also applicable to an oven in the form of an arc, or circular, or annular, or any other form.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Claims (9)

  1. Ofen (10) für die Wärmbehandlung von Vorformlingen aus thermoplastischem Material, mit wenigstens einem Kühlungskreis (16) mittels Zirkulation eines Kühlungshauptluftstroms (A), der in dem Ofen (10) nacheinander wenigstens durchquert:
    - eine Einlasszone (16a) für Kühlungsluft, die wenigstens eine Einlassleitung (18) für Luft aufweist, durch die der Kühlungshauptluftstrom (A) von außerhalb des Ofens (10) in den Ofen (10) strömen kann,
    - eine Heizzone (16b), die durch die Einlassleitung (18) mit Luft versorgt wird und Mittel (22) zum Erhitzen von Vorformlingen aufweist, und
    - eine Luftentnahmezone (16c), in die wenigstens eine Luftentnahmeleitung (42) mündet,
    wobei der Ofen (10) einen Umschließungsbehälter (46) umfasst, der von der Luftentnahmeleitung (42) wenigstens bis zu der Heizzone (16b) verläuft und wenigstens die Heizzone (16b) gegenüber der äußeren Umgebung des Ofens (10) isolieren kann, um die Verschmutzung des Innenraums des Ofens (10) durch in der Luft transportierte Schmutzpartikel zu vermeiden,
    dadurch gekennzeichnet, dass der Umschließungsbehälter (46) wenigstens eine so genannte sekundäre Lufteintrittsmündung (54) aufweist, die der Heizzone (16b) nachgeordnet ist, derart, dass ein Sekundärluftstrom (B) von außerhalb des Ofens (10) direkt durch die sekundäre Lufteintrittsmündung (54) bis zu der Luftentnahmeleitung (42) strömt.
  2. Ofen (10) nach Anspruch 1, dadurch gekennzeichnet, dass die Lufteinlasszone (16a) Filtermittel (21, 23) umfasst, die dazu bestimmt sind, Kühlungsluft, die in die Einlasszone (16a) eingelassen wird, zu filtern.
  3. Ofen (10) nach Anspruch 2, dadurch gekennzeichnet, dass die Kühlungsluft-Einlasszone (16a) Mittel (70, 72) zum Detektieren der Verschmutzung der Filtermittel (21, 23) umfasst.
  4. Ofen (10) nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Umschließungsbehälter (46) wenigstens einen ersten so genannten oberen Teil aufweist, der eine in Richtung der Heizzone (16b) erweiterte Form aufweist, um den Hauptluftstrom (A) zu sammeln.
  5. Ofen (10) nach Anspruch 4, dadurch gekennzeichnet, dass der Umschließungsbehälter (46) wenigstens einen zweiten so genannten unteren Teil aufweist, der mit dem ersten Teil verbunden ist und in der Weise um den Ofen (10) verläuft, dass wenigstens die Heizzone (16b) von der äußeren Umgebung isoliert ist.
  6. Ofen (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Heizzone (16b) Belüftungsmittel (24) umfasst, die Luft, die von der Einlassleitung (18) stammt, ansaugen können und die so angesaugte Luft zu den Vorformlingen blasen können, indem sie in der Umgebung der Vorformlinge einen Überdruck erzeugen, derart, dass nur die durch die Belüftungsmittel (24) angesaugte Luft mit den Vorformlingen in Kontakt gelangt.
  7. Ofen (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Ofen (10) wenigstens umfasst:
    - ein Luftentnahmemittel (44), das der Entnahmeleitung (42) zugeordnet ist und dafür ausgelegt ist, in der Entnahmezone (16c) stromaufseitig der Entnahmeleitung (42) einen Saugunterdruck zu erzeugen,
    - ein Mittel (62) zum Messen des Unterdrucks in der Luftentnahmezone (16c),
    - ein Mittel (60) zum Vorsteuern des Luftentnahmemittels (44) als Funktion von Parametern, die wenigstens umfassen:
    -- den Wert des Unterdrucks, der in der Luftentnahmezone (16c) durch das Messmittel (62) gemessen wird, und
    -- einen vorgegebenen Unterdruck-Sollwert, um einen Unterdruck in der Luftentnahmezone (16c) zu erzeugen, derart, dass der Entnahmeluftdurchsatz durch die Entnahmeleitung (42) größer als der Durchsatz von Luft ist, die durch die Belüftungsmittel (24) in der Heizzone (16b) zu den Vorformlingen geblasen wird.
  8. Ofen (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Ofen (10) wenigstens in einer ersten so genannten Produktionsbetriebsart arbeitet, in der die Heizmittel aktiviert sind, oder in einer zweiten so genannten produktionslosen Betriebsart arbeitet, in der die Heizmittel (22) deaktiviert sind, und dass der Ofen (10) unabhängig von der Betriebsart, in der der Ofen (10) arbeitet, ständig von dem Hauptluftstrom (A) durchquert wird, um die Ablagerung von Schmutzpartikeln innerhalb des Ofens (10) zu vermeiden.
  9. Ofen (10) nach Anspruch 7 in Kombination mit Anspruch 8, dadurch gekennzeichnet, dass sich der vorgegebene Unterdrucksollwert wahlweise als Funktion der Betriebsarten des Ofens (10) verändert, um den Durchsatz des Hauptluftstroms (A) als Funktion der ersten oder der zweiten Betriebsart, in der sich der Ofen (10) befindet, anzupassen.
EP09783964A 2008-10-22 2009-10-13 Verbesserter ofen für die thermische konditionierung von aus einem thermoplastischen material hergestellten vorformlingen Active EP2342065B1 (de)

Applications Claiming Priority (2)

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FR0857164A FR2937271B1 (fr) 2008-10-22 2008-10-22 Four perfectionne pour le conditionnement thermique de preformes en matiere thermoplastique
PCT/EP2009/063308 WO2010046270A1 (fr) 2008-10-22 2009-10-13 Four perfectionné pour le conditionnement thermique de préformes en matière thermoplastique

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EP2342065B1 true EP2342065B1 (de) 2012-09-19

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WO2010046270A1 (fr) 2010-04-29
CN102196891A (zh) 2011-09-21
FR2937271B1 (fr) 2013-01-11
EP2342065A1 (de) 2011-07-13
US20110203579A1 (en) 2011-08-25
FR2937271A1 (fr) 2010-04-23
JP5313357B2 (ja) 2013-10-09
JP2012506330A (ja) 2012-03-15
CN102196891B (zh) 2014-03-12
US8662872B2 (en) 2014-03-04

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